CN201491088U - ESD and surge protection device and circuit for Ethernet exchanger - Google Patents
ESD and surge protection device and circuit for Ethernet exchanger Download PDFInfo
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- CN201491088U CN201491088U CN2009201668645U CN200920166864U CN201491088U CN 201491088 U CN201491088 U CN 201491088U CN 2009201668645 U CN2009201668645 U CN 2009201668645U CN 200920166864 U CN200920166864 U CN 200920166864U CN 201491088 U CN201491088 U CN 201491088U
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Abstract
The utility model discloses an Ethernet exchanger interface circuit, which is applied to a device comprising an Ethernet chip, the Ethernet exchanger interface circuit and an Ethernet cable, and comprises an Ethernet transformer, a chip side interface and a cable side interface; the Ethernet transformer is connected with the Ethernet chip through the chip side interface; the Ethernet transformer is connected with the Ethernet cable through the cable side interface; the Ethernet chip and the Ethernet cable are communicated through a difference wire pair; and an energy discharge device is arranged between the difference wire pair of the cable side interface, and is used for discharging ESD or surge energy to the working place through a central pigtail of the Ethernet transformer when ESD or surge are led into a circuit, thereby playing the role of protecting the backward stage Ethernet chip.
Description
Technical field
The utility model relates to communication technical field, relates in particular to a kind of Ethernet switch ESD and surge protector and circuit.
Background technology
Ethernet interface circuit mainly divides two parts, as shown in Figure 1, a part is a chip side, i.e. the left side of Ethernet transformer and CHIP (Ethernet chip) coupling part, a part is a cable-side, i.e. Ethernet transformer the right and CABLE (Ethernet cable) coupling part.Wherein, Ethernet chip and Ethernet cable by differential lines to communicating by letter, at Ethernet cable side signal by differential signal transmission, through Ethernet transformer coupled after, become Low Voltage Differential Signal and arrive Ethernet chip.
Sometimes surge or ESD interfering energies such as (Electro Static Discharge, static discharges) may appear in the CABLE side, by behind the Ethernet transformer Ethernet chip being caused damage.In the prior art; by adopt line to using TVS protective devices such as (transient voltage killer tubes) to protect between the ground in the CHIP side; after interfering energy enters from the network interface of CABLE; transformer coupled through Ethernet to the CHIP side; TVS11 and TVS12 be the energy place of working of directly releasing, thereby play the purpose of protection back level Ethernet chip.In addition, the centre cap of Ethernet transformer is connected to the place of working (digitally) of equipment by resistance R 11 and capacitor C 11, can avoid coupling noise on the place of working to chip side, the common-mode noise that also prevents chip side is coupled on the place of working, guarantee the common-mode isolation effect of transformer, improved the Electro Magnetic Compatibility of Ethernet transformer.
Yet, in the prior art, use TVS energy directly to be released in the scheme in place of working in chip side, energy also has quite a few residual voltage to flow to Ethernet chip except releasing from the TVS pipe, thereby causes Ethernet chip to be damaged.In addition, because ethernet interface circuit generally includes a plurality of circuits, if every circuit all needs to use the TVS pipe to protect, overall plan costs an arm and a leg.
The utility model content
The utility model provides a kind of Ethernet switch ESD and surge protector and circuit, and ESD and surge are had better protective action, reduces cost simultaneously.
The utility model provides a kind of Ethernet switch interface circuit, be applied to comprise in the device of Ethernet chip, Ethernet switch interface circuit and Ethernet cable, described Ethernet switch interface circuit comprises Ethernet transformer, chip side interface and cable-side interface, described Ethernet transformer connects described Ethernet chip by described chip side interface, described Ethernet transformer connects described Ethernet cable by described cable-side interface, described Ethernet chip and described Ethernet cable by differential lines to communicating by letter;
The differential lines of described cable-side interface between also comprise energy bleed off device, be used for when ESD or surge introducing circuit, with the energy of ESD or the surge centre cap bleed off by described Ethernet transformer to the place of working, with reduce described differential lines between pressure reduction.
Described energy bleed off device comprises first set of devices and second set of devices; The clamp voltage of described first set of devices is greater than differential signal pressure reduction, and positive pole is connected to first circuit of differential lines centering, and negative pole is connected to second circuit of differential lines centering; The clamp voltage of described second set of devices is greater than differential signal pressure reduction, and positive pole is connected to second circuit of differential lines centering, and negative pole is connected to first circuit of differential lines centering.
Described first set of devices comprises at least 4 diodes of series connection; Described second set of devices comprises at least 4 diodes of series connection.
Wherein, described first set of devices comprises at least 1 diode that the TVS that oppositely connects is connected with at least one forward of series connection, and diode cathode is connected to first circuit of differential lines centering, and diode cathode is connected to second circuit of differential lines centering by TVS; Described second set of devices comprises at least 1 diode that the TVS that oppositely connects is connected with at least one forward of series connection, and diode cathode is connected to second circuit of differential lines centering, and diode cathode is connected to first circuit of differential lines centering by TVS.
Wherein, described energy bleed off device comprises diode bridge, and described diode bridge comprises: first diode, second diode, the 3rd diode, the 4th diode, the 5th diode and the 6th diode;
First circuit of differential lines centering connects the negative pole of anodal and described the 3rd diode of described first diode, second circuit of differential lines centering connects the negative pole of anodal and the 4th diode of second diode, the negative pole of described first diode and second diode is with forward the 5th, the 6th diode of connecting at least between the positive pole of described the 3rd diode and the 4th diode.
Wherein, described energy bleed off device comprises diode bridge, and described diode bridge comprises: first diode, second diode, the 3rd diode, the 4th diode, at least one TVS;
First circuit of differential lines centering connects the negative pole of anodal and described the 3rd diode of described first diode, second circuit of differential lines centering connects the negative pole of anodal and described the 4th diode of described second diode, the negative pole of described first diode and described second diode, and TVS of differential concatenation at least between the positive pole of described the 3rd diode and described the 4th diode.
Wherein, also comprise TVS respectively between described chip side differential lines pair and the place of working, be used for when ESD or surge are introduced that the energy bleed off that makes ESD or surge is to the place of working.
The utility model also provides a kind of Ethernet switch ESD and surge protector, comprise: Ethernet chip, Ethernet switch interface circuit and Ethernet cable, described Ethernet switch interface circuit comprises Ethernet transformer, chip side interface and cable-side interface, described Ethernet transformer connects described Ethernet chip by described chip side interface, described Ethernet transformer connects described Ethernet cable by described cable-side interface, described Ethernet chip and described Ethernet cable by differential lines to communicating by letter;
The differential lines of described cable-side interface between also comprise energy bleed off device, be used for when ESD or surge introducing circuit, with the energy of ESD or the surge centre cap bleed off by described Ethernet transformer to the place of working, with reduce described differential lines between pressure reduction.
Compared with prior art, the utlity model has following advantage:
In the utility model, owing to adopt diode and discrete device cheaply in Ethernet cable side, energy to ESD or surge carries out bleed off, after further slackening, process Ethernet transformer is coupled to the Ethernet chip side, reduced infringement, thereby played the effect of protection back level Ethernet chip Ethernet chip; In addition, because the utility model use is diode, cost is lower than TVS pipe price, has reduced cost.
Description of drawings
Fig. 1 is a TVS pipe guard signal schematic diagram in the prior art;
Fig. 2 is a CABLE side serial connection diode protection schematic diagram in the utility model;
Fig. 3 is a CABLE side serial connection diode protection schematic diagram in the utility model;
Fig. 4 is a diode bridge configuration schematic diagram in the utility model;
Fig. 5 is that diode bridge adds TVS pipe configuration schematic diagram in the utility model.
Embodiment
Core thinking of the present utility model is: owing to adopt diode and discrete device cheaply in Ethernet cable side, energy to ESD or surge carries out bleed off, after further slackening, process Ethernet transformer is coupled to the Ethernet chip side, reduced infringement, thereby played the effect of protection back level Ethernet chip Ethernet chip; And because the utility model use is diode, cost is lower than TVS pipe price, has reduced cost.
The utility model provides a kind of Ethernet switch interface circuit, be applied to comprise in the device of Ethernet chip, Ethernet switch interface circuit and Ethernet cable, described Ethernet switch interface circuit comprises Ethernet transformer, chip side interface and cable-side interface, described Ethernet transformer connects described Ethernet chip by described chip side interface, described Ethernet transformer connects described Ethernet cable by described cable-side interface, described Ethernet chip and described Ethernet cable by differential lines to communicating by letter;
The differential lines of described cable-side interface between also comprise energy bleed off device, be used for when ESD or surge introducing circuit, with the energy of ESD or the surge centre cap bleed off by described Ethernet transformer to the place of working, with reduce described differential lines between pressure reduction.
Below in conjunction with accompanying drawing and concrete application scenarios above-mentioned principle is elaborated.As shown in Figure 2, described energy bleed off device comprises first set of devices and second set of devices; Described first set of devices comprises at least 4 diode D21, D22, D23 and D24 of series connection, and positive pole is connected to first circuit (LINE1) of differential lines centering, and negative pole is connected to second circuit (LINE2) of differential lines centering; Described second set of devices comprises at least 4 diode D25, D26, D27 and D28 of series connection, and positive pole is connected to second circuit (LINE2) of differential lines centering, and negative pole is connected to first circuit (LINE1) of differential lines centering.Promptly CABLE side differential lines between positive and negatively respectively be connected in series at least 4 fast reaction diodes.First set of devices and second set of devices are respectively to comprise that 4 fast reaction diodes are that example describes among this embodiment, in the practical application, if the clamp voltage of fast reaction diode is bigger than 0.7V, then may use to be less than 4 fast reaction diodes, as long as the clamp voltage of assurance first set of devices and second set of devices is greater than differential signal pressure reduction.
For example, shown in Fig. 2 when ESD and surging signal when the CABLE side is introduced by LINE1, arrive LINE2 through 4 diodes of left side series connection, and by the centre cap of Ethernet transformer, through R21, C21 bleed off to the place of working, rapidly with line to pressure reduction be reduced to extremely low degree.And the residual voltage behind the process protection circuit is coupled to the Ethernet chip side after passing through further slackening of Ethernet transformer, reduces the infringement to Ethernet chip, thereby plays the effect of protection Ethernet chip.When ESD and surging signal when the CABLE side is introduced by LINE2, principle is identical, is not giving unnecessary details.
Differential lines is to generally needing by differential signal and FLP (Fast Link Pulse links pulse fast) signal.The differential signal amplitude requirement at ± 850mV between ± the 1285mV; To between the 3.1V, actual test is generally about 2.65V at 585mV for the requirement of FLP signal amplitude.Therefore adopt 4 diode series connection, each diode cut-in voltage is about 0.7V, four can be controlled at about 2.8V, when operate as normal, can not align the clamper that causes of constant sub-signal like this, be that normal differential signal pressure reduction is below clamp voltage, can not open diode in series and carry out the energy bleed off, and the voltage of ESD and surging signal is higher than clamp voltage far away, will open diode in series and carry out the energy bleed off.
Certainly, also above-mentioned first set of devices can be replaced with the reverse TVS that is connected with part diode in series in second set of devices, as shown in Figure 3, described first set of devices comprises at least 1 diode D31 that the TVS31 that oppositely connects is connected with at least one forward of series connection, diode D31 positive pole is connected to first circuit (LINE1) of differential lines centering, and diode D31 negative pole is connected to second circuit (LINE2) of differential lines centering by TVS31; Described second set of devices comprises at least 1 diode D32 that the TVS32 that oppositely connects is connected with at least one forward of series connection, diode D32 positive pole is connected to second circuit (LINE2) of differential lines centering, and diode D32 negative pole is connected to first circuit (LINE1) of differential lines centering by TVS32.Certainly, the position of D32 and TVS32 can exchange, and the position of D31 and TVS31 also can exchange.
For example, shown in Fig. 3 when ESD and surging signal when the CABLE side is introduced by LINE1, through two utmost point D1, and reverse breakdown TVS31, arrive LINE2 (because the reverse breakdown voltage of diode is higher than the reverse breakdown voltage of TVS31 far away, therefore, can not cause differential signal to be crosstalked), and by the centre cap of Ethernet transformer, through R31, C31 bleed off to the place of working, rapidly with line to pressure reduction be reduced to extremely low degree.And the residual voltage behind the process protection circuit is coupled to the Ethernet chip side after passing through further slackening of Ethernet transformer, reduces the infringement to Ethernet chip, thereby plays the effect of protection Ethernet chip.When ESD and surging signal when the CABLE side is introduced by LINE2, principle is identical, repeats no more.
In actual applications, can adopt the diode bridge connection to reduce the diode number.As shown in Figure 4: described energy bleed off device comprises diode bridge, and described diode bridge comprises: the first diode D41, the second diode D42, the 3rd diode D43, the 4th diode D44, the 5th diode D45 and the 6th diode D46; First circuit (LINE1) of differential lines centering connects the negative pole of anodal and described the 3rd diode D43 of the described first diode D41, second circuit (LINE1) of differential lines centering connects the negative pole of anodal and the 4th diode D44 of the second diode D42, the negative pole of the described first diode D41 and the second diode D42 is with connect the 5th diode D45, the 6th diode D46 of forward at least between the positive pole of described the 3rd diode D43 and the 4th diode D44.
For example, shown in Fig. 4 when ESD and surging signal when the CABLE side is introduced by LINE1, arrive LINE2 through D41, D45, D46, D44 successively, and by the centre cap of Ethernet transformer, through R41, C41 bleed off to the place of working, rapidly with line to pressure reduction be reduced to extremely low degree.And the residual voltage behind the process protection circuit is coupled to the Ethernet chip side after passing through further slackening of Ethernet transformer, reduces the infringement to Ethernet chip, thereby plays the effect of protection Ethernet chip.
Equally, also can change external D45 and two diodes of D46 into discrete TVS51, also can serve the same role, as shown in Figure 5, the negative pole of described first diode D41 and the described second diode D42, and TVS51 of differential concatenation at least between the positive pole of described the 3rd diode D43 and described the 4th diode D44.
For example, shown in Fig. 5 when ESD and surging signal when the CABLE side is introduced by LINE1, arrive LINE2 through D41, reverse breakdown TVS51, D44 successively, and by the centre cap of Ethernet transformer, through R41, C41 bleed off to the place of working, rapidly with line to pressure reduction be reduced to extremely low degree.And the residual voltage behind the process protection circuit is coupled to the Ethernet chip side after passing through further slackening of Ethernet transformer, reduces the infringement to Ethernet chip, thereby plays the effect of protection Ethernet chip.
In order to improve protection to Ethernet chip, can also be on the basis of the foregoing description, between chip side differential lines pair and place of working, increase TVS respectively, be used for when ESD or surge are introduced, the energy bleed off that makes ESD or surge is to the place of working.
The utility model also provides a kind of Ethernet switch ESD and surge protector, comprise: Ethernet chip, Ethernet switch interface circuit and Ethernet cable, described Ethernet switch interface circuit comprises Ethernet transformer, chip side interface and cable-side interface, described Ethernet transformer connects described Ethernet chip by described chip side interface, described Ethernet transformer connects described Ethernet cable by described cable-side interface, described Ethernet chip and described Ethernet cable by differential lines to communicating by letter; It is characterized in that,
The differential lines of described cable-side interface between also comprise energy bleed off device, be used for when ESD or surge introducing circuit, with the energy of ESD or the surge centre cap bleed off by described Ethernet transformer to the place of working, with reduce described differential lines between pressure reduction.
Above-mentioned the utility model sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into protection range of the present utility model.
Claims (8)
1. Ethernet switch interface circuit, be applied to comprise in the device of Ethernet chip, Ethernet switch interface circuit and Ethernet cable, described Ethernet switch interface circuit comprises Ethernet transformer, chip side interface and cable-side interface, described Ethernet transformer connects described Ethernet chip by described chip side interface, described Ethernet transformer connects described Ethernet cable by described cable-side interface, described Ethernet chip and described Ethernet cable by differential lines to communicating by letter; It is characterized in that,
The differential lines of described cable-side interface between also comprise energy bleed off device, be used for when ESD or surge introducing circuit, with the energy of ESD or the surge centre cap bleed off by described Ethernet transformer to the place of working, with reduce described differential lines between pressure reduction.
2. Ethernet switch interface circuit as claimed in claim 1 is characterized in that, described energy bleed off device comprises first set of devices and second set of devices; The clamp voltage of described first set of devices is greater than differential signal pressure reduction, and positive pole is connected to first circuit of differential lines centering, and negative pole is connected to second circuit of differential lines centering; The clamp voltage of described second set of devices is greater than differential signal pressure reduction, and positive pole is connected to second circuit of differential lines centering, and negative pole is connected to first circuit of differential lines centering.
3. Ethernet switch interface circuit as claimed in claim 2 is characterized in that, described first set of devices comprises at least 4 diodes of series connection; Described second set of devices comprises at least 4 diodes of series connection.
4. Ethernet switch interface circuit as claimed in claim 1, it is characterized in that, described first set of devices comprises at least 1 diode that the TVS that oppositely connects is connected with at least one forward of series connection, diode cathode is connected to first circuit of differential lines centering, and diode cathode is connected to second circuit of differential lines centering by TVS; Described second set of devices comprises at least 1 diode that the TVS that oppositely connects is connected with at least one forward of series connection, and diode cathode is connected to second circuit of differential lines centering, and diode cathode is connected to first circuit of differential lines centering by TVS.
5. Ethernet switch interface circuit as claimed in claim 1, it is characterized in that, described energy bleed off device comprises diode bridge, and described diode bridge comprises: first diode, second diode, the 3rd diode, the 4th diode, the 5th diode and the 6th diode;
First circuit of differential lines centering connects the negative pole of anodal and described the 3rd diode of described first diode, second circuit of differential lines centering connects the negative pole of anodal and the 4th diode of second diode, the negative pole of described first diode and second diode is with forward the 5th, the 6th diode of connecting at least between the positive pole of described the 3rd diode and the 4th diode.
6. Ethernet switch interface circuit as claimed in claim 1, it is characterized in that, described energy bleed off device comprises diode bridge, and described diode bridge comprises: first diode, second diode, the 3rd diode, the 4th diode, at least one TVS;
First circuit of differential lines centering connects the negative pole of anodal and described the 3rd diode of described first diode, second circuit of differential lines centering connects the negative pole of anodal and described the 4th diode of described second diode, the negative pole of described first diode and described second diode, and TVS of differential concatenation at least between the positive pole of described the 3rd diode and described the 4th diode.
7. as each described Ethernet switch interface circuit in the claim 1 to 6, it is characterized in that, also comprise TVS respectively between described chip side differential lines pair and the place of working, be used for when ESD or surge are introduced, the energy bleed off that makes ESD or surge is to the place of working.
8. Ethernet switch ESD and surge protector, it is characterized in that, comprise: Ethernet chip, Ethernet switch interface circuit and Ethernet cable, described Ethernet switch interface circuit comprises Ethernet transformer, chip side interface and cable-side interface, described Ethernet transformer connects described Ethernet chip by described chip side interface, described Ethernet transformer connects described Ethernet cable by described cable-side interface, described Ethernet chip and described Ethernet cable by differential lines to communicating by letter; It is characterized in that,
The differential lines of described cable-side interface between also comprise energy bleed off device, be used for when ESD or surge introducing circuit, with the energy of ESD or the surge centre cap bleed off by described Ethernet transformer to the place of working, with reduce described differential lines between pressure reduction.
Priority Applications (1)
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CN2009201668645U CN201491088U (en) | 2009-07-21 | 2009-07-21 | ESD and surge protection device and circuit for Ethernet exchanger |
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CN2009201668645U CN201491088U (en) | 2009-07-21 | 2009-07-21 | ESD and surge protection device and circuit for Ethernet exchanger |
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CN2009201668645U Expired - Lifetime CN201491088U (en) | 2009-07-21 | 2009-07-21 | ESD and surge protection device and circuit for Ethernet exchanger |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
CN107819588A (en) * | 2017-11-07 | 2018-03-20 | 晶晨半导体(上海)股份有限公司 | A kind of network interface circuit |
-
2009
- 2009-07-21 CN CN2009201668645U patent/CN201491088U/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
CN107819588A (en) * | 2017-11-07 | 2018-03-20 | 晶晨半导体(上海)股份有限公司 | A kind of network interface circuit |
CN107819588B (en) * | 2017-11-07 | 2020-10-30 | 晶晨半导体(上海)股份有限公司 | Network interface circuit |
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Legal Events
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GR01 | Patent grant | ||
CP03 | Change of name, title or address | ||
CP03 | Change of name, title or address |
Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |
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CX01 | Expiry of patent term | ||
CX01 | Expiry of patent term |
Granted publication date: 20100526 |